We reveal the unique and fundamental advantage of inerter-based elastic metamaterials by a comparative study among different configurations. When the embedded inerter is connected to the matrix material on both ends, the metamaterial shows definite superiority in forming a band gap in the ultralow frequency - equivalently the ultra-long wavelength - regime, where the unit cell size can be four or more orders of magnitude smaller than the operating wavelength. In addition, our parametric studies in both one and two dimensions pave the way towards designing next-generation metamaterials for structural vibration mitigation.
This paper introduces a hybrid wave-current energy converter (HWCEC) that simultaneously harvests energy from current and waves. Wave energy is extracted through relative heaving motion between a floating buoy and a fully submerged second body. Current energy is extracted using a hydro turbine. A mechanical motion rectifier (MMR) based on one-way clutches merges the separate current and wave power inputs and converts bidirectional, up-and-down wave input motion into unidirectional rotation of the generator shaft through different engagement statuses of the set of one-way clutches. A time domain simulation is conducted with hydrodynamic coefficients obtained from computational fluid dynamics software and boundary element software. Simulation results show an improvement in output energy and peak to average ratio compared to both turbine and point absorber wave energy converters acting individually.
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